Abstract
In shrink-fitting assembly process of aluminum alloy drill pipe with steel joint, the relationship between cooling water velocity, initial heating temperature, and thermal deformation of the steel joint is an important factor to ensure the long-term reliability of the connection and the performance. In this article, the shrink-fitting assembly experiment of aluminum pipe with steel joint was conducted and the accurate experimental data were obtained for temperature field. A finite element method was then applied to simulate the temperature field of steel joint and compared with the experimental results. Based on the thermo-elasticity theories, an analytical solution was developed to calculate the thermal deformation in radial direction within the same cross section. A least-square fitting procedure was used to determine the thermal deformation of steel joint. A relationship diagram among these three factors was established, which is particularly important in predicting the minimum heating temperature of steel joint and the minimum cooling water velocity. Based on the above analysis, a method to select the initial heating temperature and the cooling water velocity was provided and the optimum values of the magnitude of interference, the initial heating temperature, and the cooling water velocity were obtained.
Highlights
With the rapid development of oil and gas industry together with advances in the geological exploration industry, drilling depth has been greatly increasing, this exerting higher requirements on working properties of drilling pipes
It is an important factor to accurately get the relationship among flow velocity of cooling water, initial heating temperature of joint, and thermal deformation quantity of joint, to achieve shrink-fitting assembly and guarantee the reliability of connection
The temperature field distribution of steel joint was determined by carrying out finite element simulation of temperature field in the process of shrink-fitting assembly
Summary
With the rapid development of oil and gas industry together with advances in the geological exploration industry, drilling depth has been greatly increasing, this exerting higher requirements on working properties of drilling pipes. V Tikhonov et al studied the stress distribution within the assembly in detail and calculated the stress concentration factors under different axial loads, flexural moment ranges, interference friction coefficients, and interference magnitudes of connection They conducted fatigue testing on full-size aluminum alloy pipe connections using four-point bending fatigue machine and resonant fatigue test machine and comparatively verified the findings with simulation analysis results.[4]. Connection between aluminum alloy pipe bodies and steel joints is pursued on the basis of the interference fitting-based heat assembly technique. The study of flow rate of cooling water, initial heating temperature, and thermal deformation amount of the joint during shrink-fitting assembly process is of great importance. The main study aims of this article were to explore the relationship among cooling water rate, initial heating temperature, and thermal deformation amount of the steel joint.
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